"I know from experience..." Hmmm, all the Mexicans, Cubans and South Americans that I know are here legally.
What does your car accident have to do with this? Was this a three car-accident and you, too, were injured in the same accident where the woman ended up dying? You were a witness? If NOT, you are only assuming something you can't prove.
I can prove they were here illegally as they involved 7 cars in their accident, and we did get the info from the police, so do you have any idea what you are talking about?
Really? Have you checked their visas expiration date? I don't believe you know for sure.